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Eclipse Community ForumsSingleton instance of matcher per grammar
https://www.eclipse.org/forums/index.php/mv/msg/369986/903553/#msg_903553
Have noticed that during serialization process of quite a few files with formatting enabled, sufficient time goes into createMatcher() in org.eclipse.xtext.formatting.impl.AbstractDeclarativeFormatter.
For cases where model files are high having a singleton instance would have saved processing time.